Precambrian Stromatolites as Indicators of Polar Shift

  title={Precambrian Stromatolites as Indicators of Polar Shift},
  author={Stephan C. Nordeng},
Analysis of oriented specimens of stromatolites from the Lower Huronian Animikean of some authors of the Upper Peninsula of Michigan the Middle Huronian of the Eastern Mesabi Range of Minnesota and the Upper Keweenawan of Ivlichigan shows that these structures have a preferred direction of growth Study of the literature on calcareous algae and of numerous occurrences besides those men tioned has led the writer to certain conclusions concerning the factors by which the colonial growth forms are… CONTINUE READING